Got my used springfield socom16 today. The rifle itself looks like it's in good condition. It came with two 20 rd mags, and they are a son of a gun to put in. There's a lot of resistance putting them in and I feel like I'm breaking something. one of them goes in and comes out fine with a little effort, the other one not so much. I don't know who makes them as I see no markings on it. The 10rd springfield mag goes in and out just fine. Should I just toss these 20rd mags?